Extractor fan installation in Greater London

For Greater London landlords and homeowners alike, a tested fan is the cheapest ventilation upgrade there is.

We carry out extractor fan installation across Greater London, including Islington, Westminster, Bexley, Barking and Archway. Prices use London rates. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.

Extractor fans in Greater London at a glance

Area: Greater London
Towns listed: 216, largest Brent
Postcode districts: SM2, KT1, KT2, N1, N1C and RM11
Price region: London
Survey: Free survey (UK mainland)

How we do it

The rate a fan delivers through a real duct run is often far lower than the number on the box, which is why we size to the room and test the result. For England, Approved Document F gives minimum intermittent extract rates: 15 litres a second for a bathroom, 30 for a kitchen with a cooker hood (60 without one), 30 for a utility room and 6 for a WC. Wales, Scotland and Northern Ireland have their own rules, which we follow where the job is.

Kitchen extract and cooker hoods

A wall or window fan, or a cooker hood ducted outside rather than recirculating.

Like-for-like replacement

A new fan on the existing duct and wiring, often with an overrun timer or humidity sensor.

New fan through an outside wall

Core drilled, sleeved, wired from a fused spur and sealed outside.

Guide prices in Greater London

Extractor fan installation guide prices in Greater London
Work	Guide price
Like-for-like extractor fan replacement (existing duct and wiring) (per fan)	£210–£355 inc VAT
New extractor fan through an outside wall (core drilled, wired, tested) (per fan)	£415–£650 inc VAT
New ducted fan to outside through the loft or ceiling (insulated duct, roof or soffit outlet) (per fan)	£525–£900 inc VAT
Inline fan for a shower room or en-suite (loft-mounted, one or two ceiling grilles) (per room)	£650–£1,075 inc VAT
Kitchen extract fan, or cooker hood ducted to outside (per kitchen)	£475–£825 inc VAT

London rates shown. Prices include VAT at 20%. The fixed price is confirmed in writing after we have seen the job.

Signs it is time to call us

A kitchen with a recirculating hood and condensation on the windows
Mirror still steamed up 20 minutes after a shower
Mould on the bathroom ceiling or around the window

Rules in England

English building work follows Approved Document F (2021 edition) for ventilation rates, installation and commissioning. For homes, it sets minimum extract rates such as 15 litres a second for a bathroom and 30 or 60 for a kitchen, and expects mechanical systems to be airflow-tested.

How the job runs

Quick survey
Choose the fan
Fit and duct
Wire
Test

Towns we cover in Greater London

Questions about extractor fan installation in Greater London

Are prices different in Greater London?

Our guide prices are adjusted by region. In Greater London we use London rates, so like-for-like extractor fan replacement (existing duct and wiring) is typically £210 to £355 inc VAT per fan.

Do you need building regulations for a new extractor fan?

Fitting or replacing an extractor fan has to meet the ventilation and electrical rules, and certain electrical work is notifiable. We do the work to the current standards. Electrical work that is notifiable is certified by a registered electrician, and you get a copy of the certificate and our airflow readings.

How long does fitting a fan take?

A straight replacement takes an hour or two. A new fan with a core-drilled hole or a duct through the loft usually takes half a day.

Is the survey free in Greater London?

For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.

Which rules apply to ventilation in Greater London?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.

Send a photo of the existing fan and the outside wall and we will price your Greater London job quickly.